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Note Attachments

Each note can hold binary attachments (images, PDFs, ZIP, anything). They live alongside the markdown file and travel with the warehouse + the published static site.

Storage layout

text

The directory is created lazily on the first attachment, removed when the note is deleted, and replicated verbatim to the warehouse repo so other machines pick it up on Warehouse: Pull.

Drag-and-drop

Drop one or many files onto the editor (view or edit mode); each file is read as base64, sent to the extension via attachUpload, written into the attachments dir with a sanitised + collision-resolved filename, and then a markdown reference is appended at the end of the note:

image-like file → ![filename](id-attachments/filename)
anything else → [filename](id-attachments/filename)

Move the inserted line wherever you'd like. Multiple drops in quick succession all stack at the bottom in arrival order.

Filename hygiene

Path separators (/, \) and any character outside [A-Za-z0-9._-] are collapsed to -.
Leading/trailing dashes are stripped.
Maximum length is 96 characters, preserving the extension.
On collision, -1, -2, … are appended to the basename until a free slot is found. After 10k attempts (essentially never), a timestamp suffix is used as a last resort.

Warehouse sync

materializeScope copies each attachment into <scope>/<id>-attachments/ on the warehouse clone, lists the filenames in _index.json under attachments?: string[], and deletes the dir whenever a note disappears from the local index. Pull mirrors this — readRemoteAttachments walks the listed names and importNote writes them next to the new local note.

This means the commit churn includes binary diffs. For huge attachments this is fine but suboptimal — Git LFS support is a future-work item.

Published site

PublishManager.collectAll walks listAttachments(note) and queues each file into a parallel attachments[] plan. After page rendering, each attachment is copied verbatim into notes/<id>-attachments/<filename> so the relative links inside the markdown body resolve naturally.

The build wipes the publish branch's working copy before each run, so removed attachments stop being served on the next deploy.

Limitations (intentionally out of scope for the first cut)

No size cap — multi-GB drops will still try to fit in memory because the webview encodes via FileReader. If you need that, add a streaming workaround.
No re-link rewriting on note rename. The folder is keyed by id, not title, so renames don't break links. But if you manually rename a file in the attachments dir on disk, the markdown body won't follow.
No drag-drop out of the note (e.g. reusing an attachment in another note). Copy the markdown reference yourself if needed.
No Git LFS — every push still goes through the standard transport.

Implementation map

File	Role
`packages/core/src/attachments/index.ts`	Pure helpers (sanitise, collision, image detection, markdown emission)
`src/notes/notesStore.ts`	`addAttachment`, `listAttachments`, `deleteAttachment`, `attachmentUri`, `importNote(meta, content, attachments?)`
`src/notes/notesAttachmentUploader.ts`	Bridges the editor IPC into the store
`src/editor/markdownEditorProvider.ts`	`attachAttachmentUploader`, handles `attachUpload` messages
`src/webview/main.ts`	`bindDragDropAttachments` — captures files, base64-encodes, posts to host
`src/warehouse/warehouseSync.ts`	Copies attachment dirs both ways, indexes them in `_index.json`
`src/publish/publishManager.ts`	Copies attachments into the static site

Testing

$ pnpm dlx vitest run tests/unit/attachments

19 tests cover the pure helpers (filename sanitisation, path traversal, length cap, collision resolution, image detection, markdown emission).